// support.js
class Container {
  static of(value) {
      return new Container(value)
  }
  
  constructor(value) {
      this._value = value;
  }
  
  map(fn) {
      return Container.of(fn(this._value))
  }
}

class Maybe {
  static of(x) {
      return new Maybe(x)
  }
  
  isNothing() {
      return this._value === null || this._value === undefined
  }
  
  constructor(x) {
      this._value = x
  }
  
  map(fn) {
      return this.isNothing() ? this : Maybe.of(fn(this._value))
  }
}

module.exports = { Maybe, Container }